Download LimeRa1n Geohot. It is so unexpectable and unpredictable as well, knowing the Geohot come back to jailbreak community after months of disappearance. Just red the news about this from RedmondPie. The BlacRa1n jailbreak tool owner brings the complete new bootrom exploit also to pwn all iOS devices running on iOS 4.1 for life in his hand, the tool is called Limera1n. And the news about his return is confirmed by Chronic Dev Team via Twitter

Currently Limera1n is available for Windows only (download link below of this article), but don't worry for Mac and Linux users, soon the jailbreaking tool will be coming to your platforms as it's promised below:

limera1n, 6 months in the making
iPhone 3GS, iPod Touch 3G, iPad, iPhone 4, iPod Touch 4G
4.0-4.1 and beyond+++
limera1n is unpatchable
untethered thanks to jailbreakme star comex
released today to get chronicdev to do the right thing
brought to you by geohotMac and Linux coming soon
follow the instructions in the box, sadly limera1n isn’t one click
that’s the price of unpatchability
as usual, donations appreciated but not required
still in beta, pardon my ragged edges
zero pictures of my face